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The image shows a cooking device, powered by electricity, viewed from above, called an electric hob.

The electric hob is a concept inspired by the traditional cooktop above the stove, only it is portable, light, small and easy to use.

For its operation, it has attached a cable that supplies with electricity from the socket, and by starting one of the four burners, it will heat its ring surface and the vessel placed above it.

This is a model of a four-burner electric hob, of different ring sizes, respectively, one with a smaller diameter in the upper left and lower right, and one with a large diameter in the lower left and upper right.

Cooking zones that are heated are shown by thickened circles in the center of which are three other circles arranged in descending order, according to the size of the diameter.

The hob plate is rendered blank, outlined in the shape of a square.

In the lower central part are positioned the control buttons: start / stop, stopwatch to monitor the evolution of each type of food, lock buttons, adjust the power steps indicated with plus above and minus down.

General information

Until the discovery of the fire, people fed on various fruits, roots, and raw meat. With the discovery of fire and the invention of clay vessels, thermal methods of food preparation were discovered. By boiling or roasting, the food became tastier. In addition to the improved taste, it has been discovered that by thermal processing methods, food can be preserved for longer. By boiling or frying, bacteria that promote food alteration are destroyed.

If at first the use of fire was only possible in the open air, with the appearance of stoves it could also be used inside the dwellings. Thus, the stoves with the hob appeared, but also spaces in the house dedicated to cooking, that is, the kitchens.

Electric plates are the cooking areas of a stove or stove, either traditional or electric. The stoves can be built of brick, clay, iron or cast iron. Depending on the raw material used for heating, we distinguish solid fuel stoves such as wood,gas stoves, such as natural gas, but in the past, liquid fuel stoves such as fuel oil or diesel have been used.

With the discovery of electricity, electric hobs appeared. They have the advantage that they do not use fuel combustion and therefore do not pollute. Another important advantage over traditional stoves is portability, an electric hob can be used wherever there is a power source. In addition, they have the major advantage that they can keep the temperature constant, so cooking becomes much more comfortable.

Electrical plates have gone through several phases of development. In 1891, the first electric hob was based on a resistance, a tungsten filament, which at the action of the electric current warmed up and became incandescent. This filament was located under the metal hob itself and was wrapped on the back of the hob in the form of concentric circles. This ensures the uniform transfer of heat from the filament to the cooking area. This type of hob is still on the market today and is the cheapest solution for those who want an electric stove. The biggest disadvantage of this type of electric hob is the high consumption of electricity, due to poor thermal transfer. In short, heat the filament, heat the metal hob, then transfer the heat to the cooking dish.

Another important step in the evolution of electric hobs was the appearance of vitroceramic hobs. The surface of these hobs is not metallic, but, as the name suggests, ceramic glass. As a principle of operation, it is remarkably similar to traditional hobs. And here we encounter a metal heating element, but with other properties. The major difference is that in the case of ceramic hobs, heat is transferred upright, but not horizontally. For this reason, vitroceramic hobs have better yield and heat up even faster.

Induction plates are the most modern, convenient and fast electric cooking appliances. The operating principle is totally different compared to the traditional electric hob. Instead of classical heating elements, electromagnets are used. When we use such a hob, the generated electromagnetic field acts on the cooking dish and heats it directly. There’s no need to heat the stove itself, but heat the dish we’re cooking in. For this reason, the heat losses are very low, so the electricity consumption is also reduced. The surface of the induction hob is made of glass, as in the vitroceramic hobs.

Another important advantage of an induction hob is safety in operation. If there is no pot placed on the hob, it will not heat up at all.

The only drawback of induction hobs compared to traditional vitroceramic or electric hobs is that no kind of pots can be used, but only those that have a ferromagnetic material in their composition, e.g. cast iron or special stainless steel.

Induction and vitroceramic plates are available on the market in various forms. We can opt for built-in hobs in kitchen furniture, but we also find them incorporated into electric stoves with an oven.

Did you know that there are intelligent bag induction hobs that adjust their active surface according to the size of the cooking dish? If a small vessel is used, it will only heat the area covered by the vessel. Also, if a larger vessel is used, then the active surface of the hob will be in accordance with the contact surface between the hob and the dish.

Induction plates are the most recommended cooking appliances for people with vision impairment, due to the increased safety they provide during use.

Bibliography

  1. https://www.beko.ro/blog/2017/05/24/cum-functioneaza-si-ce-avantaje-aduce-plita-cu-inductie/
  2. https://www.aragazelectric.com/cum-functioneaza/plita-vitroceramica-cum-functioneaza-sfaturi-si-recomandari/
  3. https://studiocasa.ro/blog/plita-vitroceramica-sau-cu-inductie-avantaje-si-dezavantaje-tabel-comparativ_33
  4. https://ro.wikipedia.org/wiki/Wolfram#Istoria_%C8%99i_etimologia
  5. https://ro.wikipedia.org/wiki/Sob%C4%83
  6. https://www.culinar.ro/articole/culinar-prin-lume/istoria-gatitului-partea-i-inceputurile

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